Furnace



Oct. 15, 1929. A. MCVAY l 1,731,931

FURNACE Filed July 26, leaf/ INVENTOR .H/ezrmder/V@ Vf] BY ATTORNEY ALEXANDER MCVAY, GF SEATTLE, WASHINGTUN FURNACE Application filed July 26, 182'?. Serial No. 208,432.

This invention relates to furnaces for combustion gases between the primary coinsteam-boilers. bastion chamber 9 and the secondary combus- Tlie object of the invention is to provide a tion chamber lO. 'furnace el this character which is adapted Fuel may be supplied to the furnace -for various l'nds of uel.,but incre especially through a stolfing doorway 18 provided in 0 for burning sawmill refuse. Jdie iront Wall or, preferably, through an More specific objects and advantages of the pening i9 in the top wall l? or the tire box invention will appear in the following deasa for example, by gravitation from a iuel script-ion. feedingv conveyor of known construction, not

rlhe invention consists in toe novel eonshown.

struction, adaptation and conilnination ot dei The second combustion chamber 10 is lorices hereinafter described and claimed. cated between said bridge Wall and a barile .ln the aceonipanying drawingr,- wall 2O positioned in proximity to the rear Figure l is a longitudinal vertical section end of the boiler. ln its lower portion, said of a stean'i-boiler furnace embodying nrv inbeiiie Wall is provided with one or incre pasren'lion, the boiler being shown in side eleves sages 2l, two being;` shown in Fig'. 2, through tion; and Fig. 2 is a transverse section Which con'ibustion gases pass vfrom the second tln'ough2-2 or' Fig. l. combustion chamber 1G into the third coniln said drawing, the reference numeral 5 bastion chamber 1l. represents a steain boiler oi" the ordinary The baiilenvall passages 21 are, however, G5 cylindrical type having;` tribes 6 for the pasexto' ded forwardly as tunnels 22, into the sage of gases longitudinally troni the rear second chamber to provide above the tunnels combustion chamber, hereinafter referred to, in the rear portion et' the chamber l() a space oi" the furnace to the cliininej,7 connection G1 outside of the direct patri ot combustion gases et the 'front end ot the boiler. travelingV through the second chamber l() 7o As shown in. Fig'. 2, the boiler is supported from the message above the bridge Wall to b v bracket bers 7 upon the side Walls 8 or the the third chan'iber l1. furnace structure. The furnace is provided The upper portion of the chamber ll coniivith a tire box 1 `dining a primary coinbusinunicatef; with the boiler tubes G. Primary tion chamber 97 a second combustion chamber air for combustion purposes may be supplied l0 to the rear thereof und back or which is a through the ash pit- 2l or directly into the third combustion chamber il. lire box above the grate selectively through lllie iront part of the 'furnace structure conopenings 241 or 18 provided in the `trout Wall taining' seid primari,T combustion chanilier is 13. Secondary air is admitted into the secarr y ,':l to have the la?. protrude beondary chamber l() from rearwardly directed S0 vond the front end o ol the b iler and the orifices, such as 25, l, provided in the connection 61. Said primary combustion bridge Wall 14s such orifices communicating chamber provided with a grote l2 Which by means of a duet 26 provided in the bridge extends between the front Woll 13 and a Wall with a second duct 27 provided in the bridge Wali ldhavingaslopinrr front surface floor below the secondary and third cuin- S5 l5 which is inclined to an angle oil approxibustien chambers and thence With a supply mately 45o from ev vertical plane. Said slopduct 28 provided in the rear wall` 29 of the ino' surface 15 continues to the top et the furnace, the duct 28 having near the top of h1 ge Wall, between which and the linden wall29 an inlet 30 tor the admission ot outside oit the boiler is restricted passage for side air. The arrangement oic ducts in the 00 floor and walls tend to prevent the same from overheating, the heat thus taken from the structure serving toV preheat the secondary air which is supplied into the furnace.

An opening 31 provided with a door 32 in the wall 29 permits access into the rear end of Vthe furnace .for cleaning or other purposes.

ing the more inflammable fuel gases to bev consumed prior to contacting with the-boiler. The hot burning gases produced in the fire box are directed by the sloping surface 15 of the bridge wall against the boiler and along the under' surface of the latter until returned by conjoint action of the baffle wall and the draft pull, so to speak, at the entrance to the tunnel, as will be understood with reference to the direction arrows in the chamber 10 of Fig-1. The chilling effect of the boiler contact with the burning gases'reduces the temperature of the same to or below the temperature necessary for combustion. In the Hreverse or forward travel of the gases toward the bridge wall Vthey'encounter a fresh supply of combustion air emitted from the oriices resulting'in a burning of the unconsumedv combustible gases inV the secondary chamberwhich is completed in the third com' bustion chamber 11.

The walls of the furnace are of brick work, which become sufficiently hot to maintain combustion of fuel gases provided with a suitable quantity of air. The construction of my improved furnace and the manner of its operation will be understood from the foregoing description.

What I claim is 1. A steam-boiler furnace divided by a bridge wall and a baffle wall into three combustion chambers, with relatively small passages providing communication between the adjacent chambers above the bridge wall and through the lower port-ion of the baille wall respectively, one of said chambers being lo cated mainly in front ofthe boiler, the second chamber being located below the boiler and the third chamber to the rear thereof, the passages throughl the baille wall comprising tunnels extending from said third chamber into proximity of the forward portion of the second chamber, and means to supply air for combustion purposes separately into bot-h the first and second chambers.

2. A steam-boiler furnace divided by a bridge walll and a baille wall into three comy 'bustion'chambers with relatively small passagesv providing communication between the adjacent chambers above the bridge wall and through the lower portion of the baiie wall respectively, one of said chambers being located mainly in front of the boiler, the second chamber being located below the boiler and the third chamber to the rear thereof, the passages through the baile wall comprising tunnels extending from said third chamber into proximity of the forward portion of the second chamber.

Signed at Seattle, lVashington, this 29th day of June, 1927.

ALEXANDER MCVAY.

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